22-21-00
 -101 THRU -121;  ú ú 03 Page 25 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

TO RUDDER PCA'SARINC
CONTROL MICROPROSSER
429

RCVRDADC
DADC
A

INPUTDADC FAULTS
YDM
TO RIGHT
FAULT BALLCHANNELYAW DAMPER
FAULT
RIGHT
AUTHORITY
YAW DAMPER SERVO429
ARINCDRIVER MON NC
CODELEFT
LIMITER
MON
RCVR

CONTROL LAW
AND TURN

+ LEFT
EXTENDAPL TYPE
YAW DAMPER CMDSERVO OUT HH
D/A
(R RUDDER)YAW DAMPERAPL
COORDINATION CL
-SERVO VALID
TYPE
MON

YDMCOMP
A/DFAULT
POSITION FAULTHYDVALID
BCOMP RETRACT
HYD PRESS PRESS
(L RUDDER)FAULT BALL
MON
VOLT
LVDT H
H
ARINC

MON
DRIVERIRU
LVDT CTCT FAULTS
PRE-FLT
LVDT L L
ACTR
LVDT
TEST
429
POS
RCVR

LOGIC FAULT
26V AC REF H
L
ARINC

DEMOD
IRU
C429

YD ACT
ENGAGERCVR
INPUT
DISAGREE
YD ACTR
SOLENOIDDRIVER
MON
FAULT BALLFAULT PRE-FLTF/B DRIVERVALVE TEST
LVDT
429

ARINCIRU ENABLE
LVDT
RCVR

F/B DRIVER
HYD POWER LEFTFAULT
SERVO
IRU TEST DISCRETES PRE-FLT

IRU
FAULT
D

NO VALIDLVDT
TESTPRE-FLIGHT
FAULT
LOGIC

IRU DATA
TEST ENABLE

YAW DAMPER TEST
IN
E

PROG
FROM TYPE AND
YDM
CHAN MONYDMDISAGREE
FAULT
LATCH
COMP + 5V DC
YDMTEST IN PROGRESS
F/BALLDRIVER PWR
F
UP
AIR/GNDTEST

IN AIR
ENABLE
A/D
POWER UP

MON
ON
RESET

ENABLE
GND
IRU DADC YD ACT
FAULT BALL

SOFTWARE
DRIVER

HARDWARE
PRE-FLT TEST ENABLE
LVDTAIR/GRDHYD PRESS
INOP

RESET AUTO DISENGAGE YAW DAMPERYDM RESET ANY(STATUS AND
MONITORFAULTBALLMAINTENANCE
+ 5V DC
D/A SET
(SH 1)

MICROPROSSERMESSAGES)
(INPUTS SAME
A/D
O.C.
AS CONTROL
RIGHT EICAS CMPTR
G

MICROPROSSER)
YAW DAMPER ENGAGE YAW DAMPER(STATUS AND
MAINTENANCE(SH 1)
28V DCMESSAGES)
YAW DAMPER
INOP
H

LEFT EICAS CMPTRYAW DAMPER INOP
YAW DAMPER INOP B
+5V DC +28V DC
FLT CONT PNL(SH 1) INTERLOCK
(SH 1) INTERLOCK LEFT YAW DAMPER MODULE RIGHT YAW DAMPER
NOTE: TYPICAL SYSTEM (LEFT SYSTEM SHOWN).
Yaw Damper Schematic
Figure 8 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH YDM DASH NUMBERS ú

 22-21-00
 -101 THRU -121;  ú ú 02 Page 26 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

C1534
28V DC
28V DCSTBY BUS FLT CONT ELEK
ACCELEROMETER
1L-DC (C7)

(SH 2)
A
ELECTRONICS
C1533
FLT CONT ELEK
2L-DC (C9)

1
SIGNAL GND(|15V)OUTPUT BUS NO. 1
P11-1 CB PNL ASSY
MODAL SUPPRESSION ACCEL-L
A/P LH SIDE B15V DC
LOGIC GND (|5V)
1 L AIR DATA CMPTR
15V DC G1

POWEROUTPUT BUS NO. 2
DISTR
OUTPUT

15V DC
|15V DC
A
15V DC

15V DC B8 2 R AIR DATA CMPTR
DATA BUS NO. 1
5V DC

IRU SELF TEST
OUTPUT
POWER TOMONITOR P
2
15V DC

L IRU DATA BUS NO. 3
|15V DC 15V DC
C
OUTPUT IRU SELF TEST 5V DC2 C IRU
OUTPUT
DATA BUS NO. 2
PSM 1 VALID
PSM

IRU SELF TEST
VALID PSM 2 VALID

D R IRU
PWR
PSM 1 RESETUP
PSM(SH 2)
RESET

PSM 2 RESET
CSEU PWR SPLY 1L AIR/GND 1
AIRAIR/GND 1/2
15V DC
E
|15V DC 15V DCSIGNAL GND(|15V)AIR/GND 2
OUTPUT
1
GND
LOGIC GND (|5V)
5V DC

2
KXXX CSEU AIR/GND
OUTPUT POWERDISTR
　
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